// t, b, c, d means:
// easeInQuad( time, fromValue, toValue, totalTime );
// time++

function linear(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * (t / d) + b;
}

function easeInQuad(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * (t /= d) * t + b;
}

function easeOutQuad(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return -c * (t /= d) * (t - 2) + b;
}

function easeInOutQuad(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d / 2) < 1) return (c / 2) * t * t + b;
	return (-c / 2) * (--t * (t - 2) - 1) + b;
}

function easeInCubic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * (t /= d) * t * t + b;
}

function easeOutCubic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * ((t = t / d - 1) * t * t + 1) + b;
}

function easeInOutCubic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d / 2) < 1) return (c / 2) * t * t * t + b;
	return (c / 2) * ((t -= 2) * t * t + 2) + b;
}

function easeInQuart(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * (t /= d) * t * t * t + b;
}

function easeOutQuart(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return -c * ((t = t / d - 1) * t * t * t - 1) + b;
}

function easeInOutQuart(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t + b;
	return (-c / 2) * ((t -= 2) * t * t * t - 2) + b;
}

function easeInQuint(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * (t /= d) * t * t * t * t + b;
}

function easeOutQuint(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
}

function easeInOutQuint(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t * t + b;
	return (c / 2) * ((t -= 2) * t * t * t * t + 2) + b;
}

function easeInSine(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return -c * Math.cos((t / d) * (Math.PI / 2)) + c + b;
}

function easeOutSine(t, b, c, d) {
	return c * Math.sin((t / d) * (Math.PI / 2)) + b;
}

function easeInOutSine(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return (-c / 2) * (Math.cos((Math.PI * t) / d) - 1) + b;
}

function easeInExpo(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return t == 0 ? b : c * 2 ** (10 * (t / d - 1)) + b;
}

function easeOutExpo(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return t == d ? b + c : c * (-(2 ** ((-10 * t) / d)) + 1) + b;
}

function easeInOutExpo(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if (t == 0) return b;
	if (t == d) return b + c;
	if ((t /= d / 2) < 1) return (c / 2) * 2 ** (10 * (t - 1)) + b;
	return (c / 2) * (-(2 ** (-10 * --t)) + 2) + b;
}

function easeInCirc(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
}

function easeOutCirc(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
}

function easeInOutCirc(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d / 2) < 1) return (-c / 2) * (Math.sqrt(1 - t * t) - 1) + b;
	return (c / 2) * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
}

function easeInElastic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	let s = 1.70158;
	let p = 0;
	let a = c;
	if (t == 0) return b;
	if ((t /= d) == 1) return b + c;
	if (!p) p = d * 0.3;
	if (a < Math.abs(c)) {
		a = c;
		s = p / 4;
	} else s = (p / (2 * Math.PI)) * Math.asin(c / a);
	return -(a * 2 ** (10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p)) + b;
}

function easeOutElastic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	let s = 1.70158;
	let p = 0;
	let a = c;
	if (t == 0) return b;
	if ((t /= d) == 1) return b + c;
	if (!p) p = d * 0.3;
	if (a < Math.abs(c)) {
		a = c;
		s = p / 4;
	} else s = (p / (2 * Math.PI)) * Math.asin(c / a);
	return a * 2 ** (-10 * t) * Math.sin(((t * d - s) * (2 * Math.PI)) / p) + c + b;
}

function easeInOutElastic(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	let s = 1.70158;
	let p = 0;
	let a = c;
	if (t == 0) return b;
	if ((t /= d / 2) == 2) return b + c;
	if (!p) p = d * (0.3 * 1.5);
	if (a < Math.abs(c)) {
		a = c;
		s = p / 4;
	} else s = (p / (2 * Math.PI)) * Math.asin(c / a);
	if (t < 1) return -0.5 * (a * 2 ** (10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p)) + b;
	return a * 2 ** (-10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p) * 0.5 + c + b;
}

function easeInBack(t, b, c, d, s) {
	t = Math.min(t, d);
	c = c - b;
	if (s == undefined) s = 1.70158;
	return c * (t /= d) * t * ((s + 1) * t - s) + b;
}

function easeOutBack(t, b, c, d, s) {
	t = Math.min(t, d);
	c = c - b;
	if (s == undefined) s = 1.70158;
	return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
}

function easeInOutBack(t, b, c, d, s) {
	t = Math.min(t, d);
	c = c - b;
	if (s == undefined) s = 1.70158;
	if ((t /= d / 2) < 1) return (c / 2) * (t * t * (((s *= 1.525) + 1) * t - s)) + b;
	return (c / 2) * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b;
}

function easeOutBounce(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if ((t /= d) < 1 / 2.75) {
		return c * (7.5625 * t * t) + b;
	} else if (t < 2 / 2.75) {
		return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b;
	} else if (t < 2.5 / 2.75) {
		return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b;
	} else {
		return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b;
	}
}

function easeInBounce(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	return c - easeOutBounce(d - t, 0, c, d) + b;
}

function easeInOutBounce(t, b, c, d) {
	t = Math.min(t, d);
	c = c - b;
	if (t < d / 2) return easeInBounce(t * 2, 0, c, d) * 0.5 + b;
	return easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;
}

export {
	linear,
	easeInQuad,
	easeOutQuad,
	easeInOutQuad,
	easeInCubic,
	easeOutCubic,
	easeInOutCubic,
	easeInQuart,
	easeOutQuart,
	easeInOutQuart,
	easeInQuint,
	easeOutQuint,
	easeInOutQuint,
	easeInSine,
	easeOutSine,
	easeInOutSine,
	easeInExpo,
	easeOutExpo,
	easeInOutExpo,
	easeInCirc,
	easeOutCirc,
	easeInOutCirc,
	easeInElastic,
	easeOutElastic,
	easeInOutElastic,
	easeInBack,
	easeOutBack,
	easeInOutBack,
	easeOutBounce,
	easeInBounce,
	easeInOutBounce
};
